Is it OK to marry someone to assist them with becoming a citizen ?

What you are describing seems like sham marriage, whack is illegal.

Deffered Action, normal processing times?

Recently, I have seen approvals in less than 4 months. Every case is different; you have to wait at least 6 months before you can place a service...

How long do you have to reside in the United States if your parent file for you

You cannot vote. The first part of your question is not clear.

120 days after marriage-based AOS interview

Possibly the criminal background check. Sometimes the fingerprints clear but not the name check.

Can I travel to India in NOV-2013 and come back before my visa expires.

Yes, if you continue working for the same employer

Can I use my mothers priority date?

Only if your mother became a US citizen before you got married and the petition has not been cancelled.

How can I get my husband to be my sponsor instead of my stepdad?

Not possible, but when you become a US citizen your stepdad will be off the hook.

B2-Visa Entry..Question

If he is admitted as B2, he may be authorized for up to 6 months even if the visa expires 15 days from entry. Yes. If they give him less than 6...

Can my wife and I travel to US Territories while my I130 and her I485 Change of Status are in process?

It is best not to travel if it involves international waters, even though destination is U.S. territory. Just wait until she gets her green card...

It depends on what happened at the interview and what being reviewed.

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